|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : lax|
|Altitude||msl bound lower : 14000|
msl bound upper : 14000
|Controlling Facilities||artcc : zla|
|Operator||common carrier : air carrier|
|Make Model Name||Large Transport, Low Wing, 2 Turbojet Eng|
|Flight Phase||descent other|
|Route In Use||arrival : profile descent|
|Affiliation||government : faa|
|Function||controller : radar|
|Qualification||controller : radar|
|Experience||controller radar : 20|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Anomaly||non adherence : clearance|
|Independent Detector||other controllera|
|Resolutory Action||controller : issued new clearance|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
Air carrier X inbound to los angeles was descending on the civet profile assigned 320 KTS. He was the first of a string of 5 aircraft. Even though assigned 320 KTS by ATC he elected to reduce his airspeed without advising the controller. When I observed the ground speed reducing, I asked pilot to verify doing 320 KTS and he advised he was slowing. This resulted in los angeles approach having to accept handoffs on the next 2 aircraft with less than the established flow control spacing and the last 2 aircraft in the string had to have the profile descent cancelled and were vectored off the localizer for spacing, then back onto the localizer. Had air carrier X complied with his speed assignment this would not have been necessary.
Original NASA ASRS Text
Title: ACR DID NOT COMPLY WITH SPEED RESTRICTION AND CAUSED FLOW CTL PROBLEMS WITH 4 SUCCEEDING ACFT.
Narrative: ACR X INBND TO LOS ANGELES WAS DESCENDING ON THE CIVET PROFILE ASSIGNED 320 KTS. HE WAS THE FIRST OF A STRING OF 5 ACFT. EVEN THOUGH ASSIGNED 320 KTS BY ATC HE ELECTED TO REDUCE HIS AIRSPEED WITHOUT ADVISING THE CTLR. WHEN I OBSERVED THE GND SPEED REDUCING, I ASKED PLT TO VERIFY DOING 320 KTS AND HE ADVISED HE WAS SLOWING. THIS RESULTED IN LOS ANGELES APCH HAVING TO ACCEPT HANDOFFS ON THE NEXT 2 ACFT WITH LESS THAN THE ESTABLISHED FLOW CTL SPACING AND THE LAST 2 ACFT IN THE STRING HAD TO HAVE THE PROFILE DSCNT CANCELLED AND WERE VECTORED OFF THE LOC FOR SPACING, THEN BACK ONTO THE LOC. HAD ACR X COMPLIED WITH HIS SPEED ASSIGNMENT THIS WOULD NOT HAVE BEEN NECESSARY.
Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.